Google is very picky about duplicate pages and may penalize your site if it finds too much (or any?) duplicate content. To help squeeze a little-bit more SEO friendliness out of Drupal you can add a few entries to your ROBOTS.TXT to avoid duplicate pages from being indexed and keep the search-bots away from pages that they don't really need to be in.
If you are using Drupal 5 or older, try adding these entries to your ROBOTS.TXT
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